Brake attachment for sewing-machines.



c. E. JUHNSON n. BRAKE ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED I`EVB.3,19104 1,027,339. I PatentedMayZl, 1912.

UNiTED sTATEs PATENT oEEicE.

CARL E. JOHNSON, or Los ANGEILES, CALIFORNIA, AssIGNoR To lUNITED STATES ELEC'IIRICAL MANUFACTURING Compliance Los ANGELES, CALIFORNIA, A Cort PORATION OF CALIFORNIA.

BRAKE ATTACHMENT FOR SEWINGMACHINES.

Sp-eccationrof Letters 1 atent. Patented RIay 21, 1912,

Application filed FebruaryA 3, 1910. Serial N. 541,892.

. i To atl whom 'it may concern:

'Be it known. that I, CARL E` Jo-iiNsoN, a citizen ot' the United@ States, residing. at

Los Angeles, inI the county of' Los .Angeles and Stateoi California, liaveinvented a new and useful BrakeAttachment for Sewiiig-Machinos, of which the following` is a specification.

This invention relates to a brake which may 10`be attached to a sewing machine, and one of the main `objects oi the invention is to provide a brake for sewingjinachiiies which is in the form ot an attachment which can be appl-ied to any of the ordinary types of sew`v ing machines by any person without requiringiany alteration of the machine or any tools other than an ordinary screw driver. The attachment is particularly designed to be used with sewing machines which aie 'operated by a motor, and a further objectis to provide for automatically applying the brake when thepower is reduced orthiow'n vottl entirely from the sewing machine.

.The device is of particular advantage when employed as `an attachment in con nection with the motor attachment for sewing machines and,the like which forms the subject of a foi-nder patent of mine issued September 7th, 1909, No. 933,710', in which the motor is mounted 'upon the treadle'of the sewing machine and coiinectedpby belt with the driving wheel of the `sewing ma- `chine in such a manner that the belt may be tightened or loosened by manipulating the treadle, power being applied to the machine when the belt is tightened and power being thrown ott' from the sewing machine when' the belt .is slackened, and a further object of the present invention is to cause the brake to be automatically applied to stop the sewing machine when the' belt is slacliened,I

` sothatthe operator of the sewing machine is not required to devote any attention to the application or release of the brake and the. foot of the operator tilts the treadle in. the oppnsite direction which loosens the belt,

'throwing ott letzhep'owr to the machine and lat thesame time automatically applying the brake to the machine, so that the machine is stopped automatically and 'instantly upon throwing ott the power. y

The device is so constructed be attached to machines having a drop head aswell as those having a stationaryhead, without requiring any alteration in either the machine, or the brake attachment."

Other'objects and advantages of the in-r vention will be brought out in the following description.

Referring to the drawiiigst-Figure 1 .is an end, elevation of-y a Sewing machine, a portion of which is broken away to show the connection of the attachment. Fig'. 2 is a side elevation of the attachment on an enlarged scale. attachment. n .y

vThe attachment comprises a clamp con-` sisting of two '.clampingmcmbers l and 2, having hooks 3 at each end which are adapt- .ed to be inserted in the holes in the sewing machine table 4.- through which tlie belt 5 passes, and to be clamped against the inter vening portion of the table which lies between the two belt holes. The clamp mem-` bers 1 and 2 are preferably formed of sheet metal, the member 1 having an upwardiy extending loop G for the attachment of the lower end of a coil Spring/7 and -haviiigan up-turned lug 8 through which a tightening screw 9 extends, the latter being Screwed into asimilar lug 10- formed on the clamping member 2.

Extendiiigup at one side of the clamping meinbei Q is a bracket 11 to which a braire `lever 12 is pivoted by means of a screw 13.

One end of the brake lever 12 is provided `with a laterally projecting lug 1li to which a hook 15 is adjustably connected by nuts 1G,

vided with an otl' set brake'shoe 17 whichhas a leather lining 18, the brake shoe-being curved to present a concave' facey against the vthat it may Fig 3 is a vplan view of the rounded rim of the fly -w'heel 19..ot` the sewing machine. A wire or otherV connection 20 extends from a perforation 2 1 in the lever 12 to the treadle 22 of the sewing machine.` r 23 designates the motorinounted on theA t-ieadle i2 2, andft is the beltffrom the motor chine.

26 is-aspring counteracting the weight of the motor 23, the tension of which is preferably suliicient to normally carry the weight of the motor 23 so that the belt 2 is slack.

The treadle 22 is pivoted to the sewing machine at 26 and the wire 20 is connected to the treadle at 27 at a point a suiiicient disA tance from the fulcrum 26 to produce the requisite movement of the brake lever 12 when'the treadle 22 is operated.

The brake attachment is readily applied to the sewing machine by simply slipping the hooks 3 into the holes of the table and then screwing up the screw 9 to clamp the hooks 3 tightly, as shown in Fig. 1. The wire 20 may then be easily connected to the treadle by passing it down through one of the holes near the belt 5.

In the normal position of the parts the motor 23 is sustained by spring 26 with the be1t24 slacked, so that as the motor 23 perates no power is transmitted to the sewing machine. AS the motor 23 is thus sustained by the spring 26 the wire 20 is relaxed and the spring 7 holds the brake lever 12 tilted so that the shoe 17 bears against the fly wheel 19 and prevents the machine from running, although the machine ma'y easily be turned in either direction to try the needle or for any other purpose by pressing upon the 'treadle slightly enough to release the brake without making the belt 24 taut. When it is desired to operate the sewing machi'ne by the motor, the treadle l22 is operated to stretch the spring26 and lower' the mot'or 23, thereby making the belt 24 taut, whereupon power is transmitted to the driving wheel 25 of the sewing machine, andthe latter is started into operation. As the treadle 22 is thus operated the Wire 20 is pulled down which tilts the brake lever 12 and throws the shoe 17 out of contact with the fly wheel 19, thus automatically releasing the brake u on the application of the power. When tile' power is thrown 0H by relaxing the pressure on the treadle, the

spring 26 raises the motor and relaxesthe belt 24 and atthe same time the wire 20 is relaxed permitting the spring 7 to act upon theV lever 12 and swing the brake shoe 17 into contact with fly wheel 19, thus instant-ly stopping the sewing machine automatically upon throwing ott the power.

lVhat I claim is :-l

1. A brake attachment for sewing,ma chines, comprising a pair of clamping mem bers with hooks adapted to engage in the belt holes in the table of the sewin machine, a brake lever pivoted to one o said clamping members, a brake shoe on the brake'lever adapted to bear against the ily wheel of the machine, and a spring between the brake lever and the other clamping member for normally holding shoe against said ily wheel.

' 2. A brake attachment for sewing machines, comprising a.y pair of clamping members, each having a hook adapted to engage in a belt hole in the table of the machine, means for drawing said clamping members towardeach other, a bracket on one of said members, a brake lever pivoted to said bracket, a brake shoe on said lever adapted to bear against the ily wheel of the machine,

the brake a loop formed on the other clamping member, a coil spring connected to said loop, and a hook adjustably secured to the brake lever and connected to the other end of said coil spring.

3. A brake attachment for sewing machines comprising a. pair of clamping memlthe brake lever to the treadle of the sewing machine for operating the brake lever when the treadle is operated.

4. A brake attachment vfor sewing machines, comprising a pair of clamping members, each having a hook adapted to engage in a belt hole in the table of the machine, means for drawing said clamping members toward each other, a bracket on one of said members, a brake lever pivoted to said bracket, a brake shoe on said lever adapted to bear against the ly wheel of the machine, and a coil spring having one end attached to thebrake lever and the other end attached to the other clamp member.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 24th day of January, 1910.v

CARL E. JOHNSON. In presence of G. T. HACKLEY, A FRANK L. A. GRAHAM. 

